Now showing items 1-10 of 153
Ion acoustic parametric decay instability in a plasma with [beta] > 1
(Elsevier, 1976-10-04)
It is found that in a plasma with [beta] > 1 a finite amplitude ion acoustic wave is unstable and decays into two shear Alfven waves propagating in opposite directions. The threshold and growth rate of the instability ...
Obtaining real parts of scattering amplitudes directly from cross section data using derivative analyticity relations
(Elsevier, 1974-04-15)
We show that one can obtain real parts of scattering amplitudes by knowing the imaginary parts at only nearby energies. This is accomplished by re-casting the dispersion integral into an equivalent form which we will calla ...
Euclidean Fermi fields with a hermitean Feynman-Kac-Nelson formula. I
(Springer-Verlag, 1974-03)
We construct free, Euclidean, spin one-half, quantum fields with the following properties: (i) CAR; (ii) Symanzik positivity; (iii) Osterwalder-Schrader positivity; (iv) no doubling of particle or spin states. They admit ...
Modification of Stokes' law for a heated sphere in liquid helium II
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1971-07)
It is shown that the counterflow which occurs at low heat inputs in liquid helium below the λ point modifies the wake behind a steadily moving sphere. The result is valid for a low Reynolds number and limits on the range ...
Comparison of high energy neutron-nucleus total cross sections with theory
(Elsevier, 1976-06-07)
A recent paper by Julius purports to show that previous estimates of the effect of inelastic screening on neutron-nucleus total cross sections are much too large. However, we show that most of this discrepancy is due to ...
Collisional effects on the drift-cyclotron instability
(Elsevier, 1976-06)
The drift-cyclotron instability in a weakly collisional plasma is considered including temperature perturbations. Collisions are described by a model Fokker-Planck equations. The growth rate of the instability is obtained ...
Percolation and cluster distribution. III. Algorithms for the site-bond problem
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1979-11)
Algorithms for estimating the percolation probabilities and cluster size distribution are given in the framework of a Monte Carlo simulation for disordered lattices for the generalized site-bond problem. The site-bond ...
Renormalization of some one-space dimensional quantum field theories by unitary transformation
(Elsevier, 1971-11)
The one-space dimensional interaction is renormalized by unitary transformation. A uniformly convergent sequence of unitary operators is defined which transforms the sequence of cut-off Hamiltonians, arranged in order of ...
Splitting of the phonon spectrum in 3 He- 4 He solutions
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1973-07)
The dynamic structure function for 4 He- 4 He density correlations S 44 ( k , ω) is calculated as a function of the wave vector k and frequency ω for a simple model of a 3 He- 4 He solution at various temperatures and small ...
Singular f-sum rule for superfluid 4He
(Elsevier, 1979-10-15)
The validity and applicability to inelastic neutron scattering of a singular f-sum rule for superfluid helium, proposed by Griffin to explain the [varrho]s dependence in S(k, [omega]) as observed by Woods and Svensson, are ...